Report of Investigations 8836: Removal of Cyanide and Metals from Mineral Processing Waste Waters

Details

• Journal Article:
  NTIS: PB84/159458
• Personal Author:
  Schiller, Joseph E.
• Description:
  The Bureau of Mines is investigating methods to treat waste water that contains cyanide. This report describes a new method that removes heavy metals and all forms of cyanide. In the first step, hydrogen peroxide and sodium thiosulfate are added at ph 7 to 9 in a 1:2 molar ratio to convert free and weakly complexed cyanide to nontoxic thiocyanate. Then steryldimethylbenzylammonium chloride is added to precipitate ferrocyanide, and finally, ferric sulfate is added as a sweep floc and sequestrant for heavy metals. After the suspended solids settle, the water is polished by filtering. The water initially contained 1 to 5 mg/l fe, 1 to 5 mg/l cu, and 10 to 30 mg/l total cyanide; the level of each of these constituents was reduced to less than 0.02 Mg/l. [Description provided by NIOSH]
• Subjects:
  Cyanide Metals Minerals Mining Occupational Health Safety
• Source:
  NTIS: PB84/159458; :1-8
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  United States
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TCRC - Twin Cities Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  13 pdf pages
• NIOSHTIC Number:
  nn:10003250
• Federal Fiscal Year:
  1983
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:072f4448cd1b0f2761e08a12427a60e47307a9fa80e33be272a7d2077721ff1f7278349f3c9aa910d29030ca5012554a4498d03b4c20c4fa9e755d70d41c50ec
• Download URL:
  https://stacks.cdc.gov/view/cdc/10681/cdc_10681_DS1.pdf
• File Type:
  [PDF - 610.75 KB ]